PIC16F684-ESLASHST datasheet(93/164 Pages) MICROCHIP

93 / 164 page

 2004 Microchip Technology Inc.

Preliminary

DS41202C-page 91

PIC16F684

12.0

SPECIAL FEATURES OF THE

CPU

The PIC16F684 has a host of features intended to

maximize system reliability, minimize cost through

elimination of external components, provide power

saving features and offer code protection.

These features are:

• Reset

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Detect (BOD)

• Interrupts

• Watchdog Timer (WDT)

• Oscillator selection

• Sleep

• Code protection

• ID Locations

• In-Circuit Serial Programming

The PIC16F684 has two timers that offer necessary

delays on power-up. One is the Oscillator Start-up

Timer (OST), intended to keep the chip in Reset until

the crystal oscillator is stable. The other is the Power-up

Timer (PWRT), which provides a fixed delay of 64 ms

(nominal) on power-up only, designed to keep the part

in Reset while the power supply stabilizes. There is also

circuitry to reset the device if a brown-out occurs, which

can use the Power-up Timer to provide at least a 64 ms

Reset. With these three functions-on-chip, most

applications need no external Reset circuitry.

The Sleep mode is designed to offer a very low -current

Power-down mode. The user can wake-up from Sleep

through:

•External Reset

• Watchdog Timer Wake-up

• An interrupt

Several oscillator options are also made available to

allow the part to fit the application. The INTOSC option

saves system cost while the LP crystal option saves

power. A set of configuration bits are used to select

various options (see Register 12-1).

PIC16F684-E/ST Datasheet(PDF) 93 Page - Microchip Technology

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